Piston-rod packing



(No Model.)

P. J. GORMAN. PISTON ROD PACKING.

No, 596,585,; Patented Jan. 4, 1898.

J JZZD 5mm) Inventor.

\Vitnesses,

By 9W X044- Attorngy.

m: NORRIS PETERS cc" Puoraunm wnsumo'ron, By L UNITED STATES PATENTOFFICE.

PETER J GORMAN, OF BUFFALO, N-EW' YORK.

PISTON-Ron PACKING.

SPECIFICATION forming part of Letters Patent N 0. 596,585, dated January4, I898.

Application filed April 14, 1897. Serial No. 632,056. (No model.)

To all whom it may concern:

Be it known that 1, PETER J. GORMAN, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented certain new and useful Improvements in Piston-Rod Packing, ofwhich the following is a specification.

The object of my invention is to produce a packing for steam enginepiston rods or pumps or for other purposes where a steam or water tightpacking is required, and it will be fully and clearly hereinafterdescribed and claimed, reference being had to the accompanying drawings,in which- Figure 1 represents a central sectional elevation throughasteam-cylinder stuffing-box, showing a portion of a piston-rod and myimproved packing connected therewith. Fig. 2 represents a side elevationshowing a portion of the packing before being put into use in astuffing-box. Fig. 3 represents a side elevation showing a portion ofthe central core that is fitted in the perforated tubular portion. Fig.4 represents an enlarged transverse section through the packing on orabout line a a, Fig. 2. Fig. 5 represents a central section through, thecentral core, showing the preferred form in cross-section.

Referring to the drawings in detail, my improved piston-packing consistsof an outer tube 1, made of two or more thicknesses of canvas. (See Fig.4:, where four thicknesses 2, 3, 4, and 5 are shown.) On the outer andinner sides is a coating of vulcanized indiarubber 6 and 7, and betweeneach thickness is a thin layer of india-rubber cementing the wholetogether. In this tubing is a series of perforations 8. v

The above is the preferred construction; but the ordinary rubber tubinghaving 'the perforations 8 will make a good packing.

-Within the tube 1 is fitted an innercore 9, extending the entire lengthof the tube. It is preferably made of flax and lubricated with oil andgraphite; but hemp or other similar absorbent material may be used. Itis fitted in place within the tube substantially as shown in the sectionin Fig. 4. I prefer to make it substantially square in cross-section, asrepresented in Figs. 3, 4, and 5, because it more readily accommodatesitself to the sides of the piston and stufiing-box in which it isplaced. It may be made to operate if round in cross-section; but asquareor other irregular form is preferred, as it gives a more free access tothe steam which passes through the perforations 8 to the central core 9.

This packing is put in place for use by winding it spirally around thepiston-rod in the usual way within the stuifing-box, andis then securedin the ordinary way, substantially as shown in Fig. 1.

In operation this packing when first put in is comparatively loose; butwhen steam is admitted it passes through the perforations 8 into andexpands the inner core and also the perforated tubing, and the enginedoes not make more than five or six turns before the packingbecomesperfectlytight. Aftersteam is shut off and the engine becomes cool thepacking becomes comparatively loose again.

' vVhile the engine is in operation the steam carries with it a portionof the lubricating material or oil, which is absorbed by the innerabsorbent core and also by the canvas or absorbent material of which theouter tube is partly made and exposed by the perforations 8, which passthrough it. A portion of this oil as fast as it is thus absorbed isgiven out to the piston-rod, which is thereby constantly lubricated.This is an important advantage, because while it reduces the friction itmaterially increases the durability of the packing and renders theaction of the engine more uniform and easy.

I claim as my invention- 1. In a piston-packing, the combination with acombined rubber and canvas tube provided with a series of perforations,of a central core having an irregular cross-section and composed ofabsorbent material.

2. In a piston-packing, the combination of a tube made up of a series oflayers of canvas and rubber, and provided with a series of perforations,with a central absorbing-core charged with lubricating material,substantially as set forth.

3. The combination with a piston and stuff ing-box, of a packing looselyfitted around the piston, said packing comprising a tube provided with aseries of perforations and an. inner core of irregular form incrosssection loosely fitted therein whereby when steam is admitted itpasses through the perforations expanding the inner core and the tubingand thus forming a tight joint, as set forth.

PETER J. GORMAN. Witnesses:

A. J. SANGSTER,

L. M. Srone.

